had been impeding
-había estado obstruyendo
Past perfect progressiveconjugation ofimpede.There are other translations for this conjugation.

impede

The lack of political will among some Member States had been impeding progress on disarmament and non-proliferation.
La falta de voluntad política de algunos de los Estados Miembros ha impedido la consecución de progresos en la esfera del desarme y la no proliferación.
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